diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index a2107fb0..8e981de6 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -17,7 +17,7 @@ jobs:
 
     strategy:
       matrix:
-        node-version: [14.x]
+        node-version: [16.x]
 
     steps:
     - uses: actions/checkout@v2
diff --git a/.github/workflows/publish.yml b/.github/workflows/publish.yml
index 0f9fd4e2..0fcdbed3 100644
--- a/.github/workflows/publish.yml
+++ b/.github/workflows/publish.yml
@@ -16,7 +16,7 @@ jobs:
       - name: Setup Node
         uses: actions/setup-node@v2
         with:
-          node-version: '14.x'
+          node-version: '16.x'
           registry-url: 'https://registry.npmjs.org'
       - name: Build licia
         run: npm link && npm run build
diff --git a/src/cgroup.js b/src/cgroup.js
index 7ef27a73..b8e81807 100644
--- a/src/cgroup.js
+++ b/src/cgroup.js
@@ -98,7 +98,7 @@ const memory = {
         let max = Infinity;
 
         if (isV2()) {
-            let data = read('memory.max');
+            const data = read('memory.max');
             if (data !== 'max') {
                 max = toNum(data);
             }
diff --git a/src/container.js b/src/container.js
index 85609f7e..aa48b33e 100644
--- a/src/container.js
+++ b/src/container.js
@@ -127,7 +127,7 @@ function memUsage() {
 
 function memLoad() {
     let max = os.totalmem();
-    let cgroupMax = cgroup.memory.max();
+    const cgroupMax = cgroup.memory.max();
     if (cgroupMax < max) {
         max = cgroupMax;
     }
diff --git a/src/md5.js b/src/md5.js
index 8ce3c45c..c1898ea9 100644
--- a/src/md5.js
+++ b/src/md5.js
@@ -160,7 +160,7 @@ function rotl(n, b) {
 }
 
 if (isNode) {
-    let crypto = eval('require')('crypto');
+    const crypto = eval('require')('crypto');
 
     exports = function(msg) {
         if (isArr(msg)) {